Vampire series (Linda Lael Miller)

Fleeing the pain of losing her vampire twin to human mortality, Maeve Tremayne uses her powers to travel to the past, where she wanders the blood-soaked battlefields and hospitals of the American Civil War, relieving dying young men from their pain with the kiss of death. There, she meets a mortal doctor named Calder Holbrook, who immediately falls under her spell-and she reluctantly falls under his. But Maeve cannot concern herself with mortal love...